iButton Part II

The iButton (DS1922L), USB reader (DS9490B#) and environmental capsule thingy (DS9107+) arrived today. I had to dig into the source code of the example programs to figure out how to access the logger - entirely because they're idiots, as it turns out. But, after that, it was easy to start and stop a "mission" and pull off the temperature log. Naturally, the first thing I did was toss the iButton into the freezer. For your viewing pleasure, I give you my first temperature log (straight from my freezer):

The battery in this thing is amazing. I can configure it to record the temperature at a 10 minute interval and store it at -40 (C), and the battery is rated to last four years. The AA batteries in my GPS died after like twenty minutes at that temperature.